scholarly journals Autotrophic Fixed-Film Systems Treating High Strength Ammonia Wastewater

2020 ◽  
Vol 11 ◽  
Author(s):  
Hussain Aqeel ◽  
Steven N. Liss
Keyword(s):  
High Strength ◽  
Fixed Film ◽  
High Strength Ammonia Wastewater

Hydrodynamics in the packed bed of the anaerobic fixed film reactor

1996 ◽  
Vol 33 (8) ◽  
pp. 1-6 ◽  
Author(s):  
H. Chua ◽  
J. P. C. Fung
Keyword(s):  
Dispersion Model ◽  
High Strength ◽  
Packed Bed ◽  
Effluent Treatment ◽  
Hydrodynamic Characteristics ◽  
Support Medium ◽  
Fixed Film ◽  
Film Reactor ◽  
Back Mixing ◽  
Intermediate Amount

The anaerobic fixed film reactors (AFFR), containing a mixed population of bacteria immobilized on the surfaces of expanded-clay support medium, have been successfully applied in the simulation of high-strength trade effluent treatment. This paper presents residence time distribution (RTD) studies to investigate the hydrodynamic characteristics in the packed bed of this novel type of reactor under the mixing effects of an effluent recycle stream. The results show that the flow pattern is characterized by various extents of back-mixing as predicted by the dispersion model. An effluent recycle at a rate equivalent to replacing the liquid content of the AFFR three times per hour achieved a large amount of dispersion in the packed bed. The AFFR without recycle had an intermediate amount of dispersion. This study shows that treatment performance of AFFRs and the cause of reactor failure are related to the effects of the effluent recycle in diluting and distributing the organic constituents of the trade effluent.

Enhancing waste decomposition and methane production in simulated landfill using combined anaerobic reactors

2006 ◽  
Vol 53 (8) ◽  
pp. 243-251 ◽  
Author(s):  
N. Sanphoti ◽  
S. Towprayoon ◽  
P. Chaiprasert ◽  
A. Nopharatana
Keyword(s):  
Methane Production ◽  
Buffer Capacity ◽  
High Strength ◽  
Organic Content ◽  
Bioreactor Landfill ◽  
Anaerobic Reactor ◽  
Anaerobic Reactors ◽  
Fixed Film ◽  
Simulated Landfill ◽  
High Organic Content

The design of leachate recirculation to enhance municipal solid waste decomposition, methane production and microbial activities was taken into account in this study by using the combined anaerobic reactors of a simulated high organic content landfill reactor and a stabilized fixed film anaerobic reactor. The latter aimed to treat high strength leachate from the simulated landfill reactor before recirculation back to the former reactor. The results showed the possibility to apply this technique to high organic waste landfill where rapid and accumulative acids formed in the leachate were removed and treated by a fixed film anaerobic reactor. In addition, the treated leachate when circulated back to the simulated bioreactor landfill helps accelerate waste decomposition and methane production by providing buffer capacity as well as diluting organic content in the leachate to achieve the favourable conditions for acidogen and methanogen, respectively, to rapidly enter into the methanogenesis phase.

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